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Submicron Si trench profiling with an electron‐beam fabricated atomic force microscope tip

 

作者: Kam L. Lee,   David W. Abraham,   F. Secord,   L. Landstein,  

 

期刊: Journal of Vacuum Science&Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena  (AIP Available online 1991)
卷期: Volume 9, issue 6  

页码: 3562-3568

 

ISSN:1071-1023

 

年代: 1991

 

DOI:10.1116/1.585845

 

出版商: American Vacuum Society

 

关键词: ATOMIC FORCE MICROSCOPY;FABRICATION;ELECTRODES;SILICON;ENERGY BEAM DEPOSITION;ELECTRON BEAMS;SCANNING ELECTRON MICROSCOPY;COMPARATIVE EVALUATIONS;SPATIAL RESOLUTION

 

数据来源: AIP

 

摘要:

The atomic force microscope (AFM) has the potential for profiling on a nanometer scale. However, for the AFM to be useful as a reliable and accurate metrology tool, the atomic force sensor used (i.e., cantilever and sensor tip) should be highly reproducible in the fabrication process and the tip shape used should be known with high accuracy. Moreover, for profiling and critical dimension measurement of device trenches with submicron openings and trench depth of 1 μm or more, nanometer‐scale tip shapes with high aspect ratio will be required. In order to meet the above requirement, a novel high‐resolution direct electron‐beam deposition process has been developed in which a sharp tip is grown onto an existing Si cantilever structure. In the example to be discussed, sharp tips have been grown directly on the integrated tip of a micromachined Si cantilever by decomposition of a dimethyl‐gold organometallic complex. The directe‐beam deposition process provides a unique capability for the controllable fabrication of high aspect ratio, nanometer‐scale tip structures. Typical dimensions of the AFM tips achieved are 0.1 μm in column diameter, 1–4 μm high, and 15 nm in tip radius. Recent feasibility experiments of using thesee‐beam tips in the laser force microscope have demonstrated for the first time that this nano‐scale tip can be used for mapping 1‐μm‐deep Si trenches. Submicron trenches with openings as small as 0.36 μm have been successfully profiled. In this paper, various issues on tip fabrication, deep trench profiling and comparision of AFM and corresponding scanning electron microscopy measurements will be discussed.

 

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